Lathe for turning eccentric or polygonal forms



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' W. H. -LENHARTl LATHE POR TURNING'BGQBNTRIG 0R POLYGONAL FORMS. N0. 252,481. Patented Jan. 17,1882.

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W. H. LENHART. `LATHB -FOR TURNING ECGENTRIG OR POLYGONA-L FORMS. No. 252,'481` Patented 'Jem'. 17,18 8 2..

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`W. H. LENHART. LATHEPQR TURNING 800181111110 011 POLYGONAL 80111118.v

N0. 252,481.4 Patented Jan. 17,1882.

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UNITED STATES PATENT OFFICE.' 'i

WILLIAM H. LENHART, E DEFIANCE, OHIO.

LATI-lema ,Touraine Eoci-:NTRIC 0R PoLYGoNAL FORMS.

SPECIFICATION forming part of Letters Patent Ne. 252,481, dated January` 17 1882.

V `Application filed July 27,1881. (No model.)

` To all whom it may concern Be it known that I, WILLIAM H. LENHART,

. application of mechanical devices for producinga planetary movement of the work when the'lathe is intended to turn oval forms; secn ond, in'the construction and arrangement of devices for adapting the lathe to turn concentric,` folms; third, in the arrangement of devices for turn-ing polygonal forms; fourth, in adapting my lathe to combine the variousforms so as to produce composite forms; fifth, in the peculiar construction of a cutter-head with expansible knife-stocks; sixth, in 'general features of construction, whereby the capacity ot' my machine for doing work is greatly increased, its operating parts simplified, and great ease of adjustment for different work obtained. o j- 1 i Inthe drawings which form a part of this specification my machine is shown as arranged for cutting spokes, and Figure 1 is a vertical axial section of the same. Fig. 2 is an end view. Fig. 3 is a detached view of the cutterhead with expansible knife-stocks. Fig. et is adetached perspective view, showing the gears for operating the lathe-spindle,the manner of securing said spindle, and the cam and guide for radially operating the spindle; Fig. 5, a detail View, showing more clearly the gears for `operating thelathe-spindles.

A A are the two end sections of the frame, which support my machine, and in which the mainshaft B is supported. Sleeved upon the shaft B and journaled in the ends A A of the frame are the two like disks D D. These disks are provided ,with the spur-gears a a, which mesh with pinions b b on the shaft c, journaled on one side of the frame, and by which a rotary motion may he given to the disks independent of the motion of the shaft B,

E E are two blocks, one of which iis recessed into each disk and secured therein in such manner as to be held therein firmly against any displacement except in one direction, and which is radially to the disks, and is brought about and controlled in the manner and by the means hereinafter described.

F F are the two spindles of the lathe, between which the stick G (which in the draw-- ings is shown as a spoke-blank) is dogged. They revolve in'bearings d d, which form part of the sliding blocks E E.' Fastened to the inner side of each ot' the end frames, AA, is a circular bevel-gear, H, which, whenthe disks D D are rotating, communicates motion to each spindle F F through the intermediate mitert through the miter-pinion e, which is confined in its relative position upon the disk, asv shown.

in Fig. 1.- 1- i o Secured to the free end of one or bot h ,spin dles FF are the cams I and J, travelingrespectively upon the gudeways K and L, boltedl to the inner sides ofthe frames A A. V,

The guideway K and the oval cam I, used at one end of the machine, are clearly shown in Fig. 4. t In the drawings, lis an ovalcam; J, an ob long cam. The guideway K is in\1'o1ute,the guideway L a segment of a circle.

M are springs so arranged as to exert their tension to draw the blocks E into their recesses and keep the cams I and J upon the such manner as to adapt them to be radiallyV IOO which traverse the inner ends of the knives stock's, and are urged on by the groovcd cani R, which advances and retra-cts the knives through the media of roller l, arm m, and grooved disk a, to which latter the wedges are secured, all as clearly shown in the drawings.

I now proceed to describe the operation of' the machine, illustrated in the drawings as set for turning spokes.

In Fig. 2 the stick is shown in the position in which it is delivered to the machine, and automatically dogged by the spindles F I", wliich are actuated thereto by any ot' the well known devices. The machine being in motion, the stick is carried in the direction of the arrow,'(the disks D D revolving at the rate of abouttifteen turns per minute,) submitting it to 'the'action of the cutter-heads N, which revolve in a direction opposite to the disks at a speed of about six hundred turns per minute. The position ofthe stick in relation to the cutter-headsv N is now entirely governed by the cams I, traveling upon the guideways K, which are involute, so as to reduce the stick gradually'to the desired size; and ifthe cam I upon the spindle l), which holds the telly end of the spoke, is oval, the latter will also be oval, passing into a more elongated oval toward the throat ofthe spoke, which will be in form similar to the oval cam I upon the spindle l), holding the hub end. When the disks D D have Y made about one-fourth revolution the body of .the squaringcam J, which has commenced its In furnishing travel upon the guideway L, and when the cutter-headsN have finished acting upon the stick thefcuttenhead O is made to act, the cam R beingfso adjusted as to urge the knife-stocks h s'uiciently out of their recesses to make the knives t' begin to cut the footof the spoke into a l'o'rin'similar to the shape of the cam J, and cn'e'ior lnoreof the knives/can be so adjusted as to square also the throat of the spoke. As soon as the knife-stocks 1J are projected out as far as the cam R will urge them thesquaring of the foot of the spoke is finished, as this will be done before thedisks D D have Iinished threefourthsof a revolution. The spoke can be tripped out automaticallyat or near the bottom of my machine, thus having the spindles b bready to seize another stick at the former point;

It will be seen that all parts of my machine can be kept in continual motion-that is, no stoppage is required for the insertion or liberation ofthe objects to be turned-owing to the use of arotating bed Whereon the object is tin ished before one revolution of the bed is completed.

such vmachines as herein described tothe trade the particular use to which the'machine .is put will of course govern the shape and` number of'knives, the number, posit'omand shape ot' the cams I and J and guide ways K and L,and these par-ts are therefore it is adapted, I refrain from further description.

That I claim as my invention is- 1. In a lathefor turning irregular forms, the

rotating disks D and spindles b b, revolving in bearings movable radially in said disks, in combination with stationary guide/ways secured to the lathe-frame and cams secured on the spindles and traveling upon said stationary guideways, substantially as and for the purpose specified.

2. The revolving disks D, provided with'ra. dial recesses, andthe blocks E E, reciprocating in said recesses and carryin g the revolving spindles F, in combination with cams secured on said spindles and guideways rigidly'secured to the stationary lathe-framemhereby the cams moving onthe guideways will govern the radial movement of the spindles, substantially as and for the purposespeciied.

3. The combination of spindle F, squaringcam J, guideway L, and cutter-hcad O, containing expanding and contracting knife-stocksK, and mechanism, substantially as described, for

frame, and cams secured to the spindles trav-I eling on the stationary guideways, whereby'the spindles can bc moved radially to or from the cutter-heads to govern the shape'of the object being turned, substantially as described.

.15'. The cutter-head O, provided with radial ICO IIO

recesses', the knife-stocks k, sliding in said recesses and carrying knives at their outer ends, in combination with the disk a and the Wedges p, said wedges being constructed to slideone in the rear ofeach knife-stock, and each having tongues to slide in undercut recesses in Vits knife-stock, whereby they will advance or re-` tracttheknifefstocks with a positive movement, substantially as described. I

6. As a means for giving motion tothe adjustable spindles lF, the combination of spurgear H, rotary disk D, feathered shaft h, miterpinions cfg, and radially-adjustable blocksE, when arranged and operating as described.

7. In a lathe for turning irregular forms, the

combination of a series of cutter-heads which simultaneously work upon the stick in combination with two revolving spindles, stationary guideways secured to the lathe-frame, and eX- change'able'cams secured upon the spindles, whereby the `movement ot' said cams upon the guideways will automatically and independently adjust; tliespindles, substantially as and for the purpose specified.

8. In a. lathe for cutting-spokes, the combi- 5 nation of a series of revolving cutter-heads, N and O, the radially self-adjusting spindles F F, the o'xaland squaring camsl and J, and in- `volute guideways K, and circular gnidewny L, when operating and combined substantially as 1o described. p

9. The cutter-head O,knifc-stocksk,weilg0sp, and the grooved disk n, carrying said wedges, in combination with the stationary grooved cani R, the roller l, and the arm m, substantially as and for the purpose specified.

WILLIAM n. LENHAT. 

